Densification, Microstructure and Properties of 90W-7Ni-3Fe Fabricated by Selective Laser Melting
The preparation of refractory tungsten and tungsten alloys has always been challenging due to their inherent properties. Selective laser melting (SLM) offers a choice for preparing tungsten and tungsten alloys. In this work, 90W-7Ni-3Fe samples were prepared by selective laser melting and investigat...
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MDPI AG
2019-08-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/9/8/884 |
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| author | Junfeng Li Zhengying Wei Bokang Zhou Yunxiao Wu Sheng-Gui Chen Zhenzhong Sun |
| author_facet | Junfeng Li Zhengying Wei Bokang Zhou Yunxiao Wu Sheng-Gui Chen Zhenzhong Sun |
| author_sort | Junfeng Li |
| collection | DOAJ |
| description | The preparation of refractory tungsten and tungsten alloys has always been challenging due to their inherent properties. Selective laser melting (SLM) offers a choice for preparing tungsten and tungsten alloys. In this work, 90W-7Ni-3Fe samples were prepared by selective laser melting and investigated. Different process parameter combinations were designed according to the Taguchi method, and volumetric energy density (VED) was defined. Subsequently, the effects of process parameters on densification, phase composition, microstructure, tensile properties, and microhardness were investigated. Nearly a full densification sample (≥99%) was obtained under optimized process parameters, and the value of VED was no less than 300 J/mm<sup>3</sup>. Laser power had a dominant influence on densification behavior compared with other parameters. The main phases of 90W-7Ni-3Fe are W and γ-(Ni-Fe), dissolved with partial W. In addition, 90W-7Ni-3Fe showed a high tensile strength (UTS = 1121 MPa) with poor elongation (<1%). A high average microhardness (>400 HV<sub>0.3</sub>) was obtained, but the microhardness presented a fluctuation along building direction due to the inhomogeneous microstructure. |
| first_indexed | 2024-12-16T14:41:52Z |
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| id | doaj.art-c4ab5e7a475046419e9e7ddc934b2905 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-16T14:41:52Z |
| publishDate | 2019-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-c4ab5e7a475046419e9e7ddc934b29052022-12-21T22:27:54ZengMDPI AGMetals2075-47012019-08-019888410.3390/met9080884met9080884Densification, Microstructure and Properties of 90W-7Ni-3Fe Fabricated by Selective Laser MeltingJunfeng Li0Zhengying Wei1Bokang Zhou2Yunxiao Wu3Sheng-Gui Chen4Zhenzhong Sun5State Key Laboratory for Manufacturing System Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory for Manufacturing System Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory for Manufacturing System Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory for Manufacturing System Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaSchool of Mechanical Engineering, Dongguan University of Technology, Dongguan 523808, ChinaSchool of Mechanical Engineering, Dongguan University of Technology, Dongguan 523808, ChinaThe preparation of refractory tungsten and tungsten alloys has always been challenging due to their inherent properties. Selective laser melting (SLM) offers a choice for preparing tungsten and tungsten alloys. In this work, 90W-7Ni-3Fe samples were prepared by selective laser melting and investigated. Different process parameter combinations were designed according to the Taguchi method, and volumetric energy density (VED) was defined. Subsequently, the effects of process parameters on densification, phase composition, microstructure, tensile properties, and microhardness were investigated. Nearly a full densification sample (≥99%) was obtained under optimized process parameters, and the value of VED was no less than 300 J/mm<sup>3</sup>. Laser power had a dominant influence on densification behavior compared with other parameters. The main phases of 90W-7Ni-3Fe are W and γ-(Ni-Fe), dissolved with partial W. In addition, 90W-7Ni-3Fe showed a high tensile strength (UTS = 1121 MPa) with poor elongation (<1%). A high average microhardness (>400 HV<sub>0.3</sub>) was obtained, but the microhardness presented a fluctuation along building direction due to the inhomogeneous microstructure.https://www.mdpi.com/2075-4701/9/8/884selective laser melting90W-7Ni-3Fedensificationmicrostructureproperties |
| spellingShingle | Junfeng Li Zhengying Wei Bokang Zhou Yunxiao Wu Sheng-Gui Chen Zhenzhong Sun Densification, Microstructure and Properties of 90W-7Ni-3Fe Fabricated by Selective Laser Melting Metals selective laser melting 90W-7Ni-3Fe densification microstructure properties |
| title | Densification, Microstructure and Properties of 90W-7Ni-3Fe Fabricated by Selective Laser Melting |
| title_full | Densification, Microstructure and Properties of 90W-7Ni-3Fe Fabricated by Selective Laser Melting |
| title_fullStr | Densification, Microstructure and Properties of 90W-7Ni-3Fe Fabricated by Selective Laser Melting |
| title_full_unstemmed | Densification, Microstructure and Properties of 90W-7Ni-3Fe Fabricated by Selective Laser Melting |
| title_short | Densification, Microstructure and Properties of 90W-7Ni-3Fe Fabricated by Selective Laser Melting |
| title_sort | densification microstructure and properties of 90w 7ni 3fe fabricated by selective laser melting |
| topic | selective laser melting 90W-7Ni-3Fe densification microstructure properties |
| url | https://www.mdpi.com/2075-4701/9/8/884 |
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